10GHz Doppler Radar of a Coin Toss
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This is the raw output of a HB100 10.525GHz doppler radar unit fed through a small headphone amplifier and into the micropohone jack of a laptop. The transmitter was facing straight up, and I flipped a US quarter up and allowed it to fall back down near the transceiver.
The main lobes are the trip up and down as the coin flips. The little jump at the end is where it hit the surface that the radar transceiver was resting on and bounced.
I'm not sure I fully understand the harmonic look of the spectrograph, would be interested in any thoughts there. The only thing that comes to mind would be edges along the surface of the coin reflecting a bright signal closer and further from the axis of rotation? The actual coin edges would have the peak velocity, while surface features near the axis of rotation would have very minor changes in velocity as the coin spins.
HB100 - http://www.ebay.com/itm/HB100-Microwave-Motion-Sensor-10-525GHz-Doppler-Radar-Detector-for-Arduino-/281661352479 (Note: This is just one example of many sellers of this product, please use care when purchasing from ebay)
By jcims 2018-08-10
Newer version in this post - http://hforsten.com/third-version-of-homemade-6-ghz-fmcw-rad...
An interesting application of CW radar - http://hforsten.com/heartbeat-detection-with-radar.html
At 45 years old I feel like I've learned quite a bit, but when I read stuff like this I wonder if there are enough years left in my life to learn what to takes to put something like this together.
I will say that the little CW doppler radar boards are fun to tinker with. You can get them on amazon for <$10 shipped, power them with 5 volts and just wire the output to a microphone jack.
This is what a coin toss over a 10GHz doppler device sounds like: https://www.youtube.com/watch?v=8riretP8ylE
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